Stuffing-box.



W. JOHNSON.

STUFFING BOX.

APPLICATION FILED NOV. 2, 1909..

Patented Nov. 8, 1910.

WITNESSES.-

1 ATTORNEYS.

UNITED STATES PATENT OFFICE WILLS JOHNSON, 0F WILMINGTON, DELAWARE, ASSIGNOR TO E. I. DU 'PON']! DE NEMOURS POWDER COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF NEW JERSEY.

STUFFING-BOX.

Specification of Letters Patent.

Patented Nov. 8, 1910.

Application filed November 2, 1909. Serial No. 525,864.

panying drawings, which form a part of.

this specification;

The object of my invention is to provide a stufiing box especially suitable for applica tion to powder mixing machines in which it is of the utmost importance to prevent powder from getting between the mutually revolving parts, which condition, when it occurs. often results in firing the mass, with resultant destruction of the machine and danger to life.

In the drawing, which shows the application of the invention to a powder mixing machine, the figure represents a cross-section through the stuffing box.

The powder mixing machine as a whole is not illustrated, as the same forms no part of my invention, and therefore only the'part thereof to which my improved stufling box is applied is illustrated.

a represents one wall of the revoluble mixing chamber and b the revoluble shaft that carries the blades (not shown) that rotate within the mixing chamber. Projecting from and outside the wall a of the box is the annular wing 0 having a projecting sleeve 61 forming the bearing for the reduced section of the shaft 5.

e is a bushing between the sleeve (1 and shaft 6.

A circular hole is out through the wall a of the mixing chamber to accommodate the enlarged section of the shaft 7) and leave an annular space around the shaft to receive the metal box. This box is of greater internal diameter than the shaft and is thus adapted to inclose between it and the shaft a packing g of hemp or other suitable material and is provided at its outer end with an internal annular flange f adapted to loosely fit the shaft. The outer part of the box f is threaded in the orifice in the wall of the mixing chamber. The inner part of the box f is of enlarged diameter, forming an annular shoulder that abutsagainst the inner wall of the powder chamber when the box is in place.

it is a gland surrounding the shaft back of the box f, said land having a short flange h extending etween the shaft and the inner end of the box and abutting against the packing g and holding it in place and having, at its largest diameter-,

an annular flange k screw-threaded internally to engage an external screw-thread on enlarged section of the box, and screw threaded externally to receive an internally threaded cover ring 2', which abuts against the inner wall of the chamber. The externally threaded, or outer, part of the flange h of the gland h is of slightly enlarged diameter, forming a shoulder against which abuts a short inturned flange on the inner edge of the cover-ring. It will be observed that the gland is on the inside of the chamber or next to the liquid to be contained therein and effectually holds in place. the. packing, and that the cover ring is. on the outside of the gland and effectually prevents powder from passing from the chamber between the gland and the side of the box, thus allowing the outside parts to be'easily wiped off and kept clean and preventing any lea age around the shaft.

Having now fully described my invention, what I claim and desire to protect by Letters Patent is:

1. In a stufling box, in combination, a shaft, a box engaging the shaft and adapted to. receive a packing, a gland en aging the shaft and box and adapted to hold the packing in place and encircling the box. and a cover-ring encircling the gland and box.

2. In a stuffing box, in combination, a box adapted to inclose a packing, a gland adapted to engage said packing and hold it in place and having a flange extending around and engaging the box, and a cover-ring extending around and engaging the gland.

3. In a stuffing box, in combination, a box adapted to inclose a packing, a gland adapted to engage said packing and having a flange threaded on the outside of the box. and a cover ring threaded on the outside of the gland.

4. In a stufiing box, in combination, a box adapted to inclose a packing and having two external threads, a gland adapted to engage said packing and having a flange provided with an internal thread engaging one of the threads of the box and an external thread, anda cover-ring having an incyborg ternal thread engaging .the external thread l inside said. wall surrounding said shaft and on'the gland.-

5. In a stufling box, in combination, a box having an internal flange at the outer end adapted to receive a packing,.a gland at the inner end of the box having a flan e extending within the box to hold the pac ing "in place and a flange surrounding and engaging the box, and a cover ring surrounding and engagingthe gland.

6. In a stufling box, in combination, a box havin a relatively contracted externally threa ed section and a relatively. enlar ed externally threaded section and provi ed with an inturned flange and adapted to con tain a packin a land enga 1n the box and holding the picking in i ila e, and a ctlweri ring surrounding and engaging the an g 7. In a stuffing box, in combination, a box adapted to receive a packing, a gland at the inner end of the box havin a flange extending Within the box toho d'the packing in place and a flange surroundin the inner end of the box, the last named ange having an enlarged outer end, and a cover ring threaded on the enlarged outer end of the gland and having at its inner end an inturned flange ada ted to'abut against the enlarged section 0 the gland..

8. In a stufling box, in combination, a box havin a relatively contracted externally threa' ed section and a relative] enlar ed externally threaded section and provi ed with an inturned flange and adapted to contain a packing, a gland having a flange ex.-

I tending within the box to hold the packin in place and a flange. surrounding an threaded on the enlarged section of the box, the last named flange having an enlarged end section forming an external shoulder, and a cover-ring surroundin and threaded on the enlarged outer end 0 the gland and having an inturned flange adapted to abut against said shoulder.

' 9. The combination with a chamber wall and a shaft extending through an orifice in said wall of greater diameter than the shaft,

of abox surrounding the shaft and extending through and engaging said orifice, a gland engaging said box, and a cover ring surrounding said gland and box and adapted to abut against the inside of said wall.

10. The combination with a chamber wall and ashaft extending through an orifice in said wall of greater diameter than the shaft, of a box surrounding the shaft extending through and engaging said orifice and adapted to confine a packing a ainst the shaft, and a land inside said \val and en circling said box and adapted to engage the packing and holdit in place.

11'. The combination with a chamber wall and a shaft extendingthrough an orifice in said wall of greater diameter than the shaft, of a box surrounding the shaft extending through and engaging said orifice and a apted to confine a packing against the shaft, and means surrounding said box and abutted against the inside of said wall and adapted. to prevent leakage from the chamber to said box. I

12. The combination with a chamber wall and a shaft extending through an orifice in said wall of greater diameter than the shaft; of a box surrounding said shaft and having a reduced section threaded in said orifice, an inturned'flange at its outer end, and an enlarged section forming a shoulder adapted to abut against the inner side of the chamber wall; a gland inside the chamber wall and surrounding the shaft and having a flange extending within the box and a flange threaded on the outside of the enlarged section of the box, said flange having an enlarged outer end forming a shoulder; and a cover ring threaded on the outside of the enlarged section of the last named gland flange and adapted to abut against the inner side of the chamber wall and having a flange adapted to abut against the last named shoulder.

In testimony of which invention, I have hereunto set my hand, at Wilmington, Del, on this 29th day of October, 1909. v

- WILItS JOHNSON.

Witnesses:

WM. G. RAMsAY, 'Enw. J. AMoRY. 

